Install phan/phpstan local

vendor/netresearch/jsonmapper/phpunit.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0"?>
+<phpunit backupGlobals="false"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+         bootstrap="tests/bootstrap.php"
+         colors="true"
+         beStrictAboutChangesToGlobalState="true"
+         beStrictAboutOutputDuringTests="true"
+         beStrictAboutTestsThatDoNotTestAnything="true"
+>
+    <coverage>
+        <include>
+            <directory suffix=".php">src/</directory>
+        </include>
+    </coverage>
+    <testsuites>
+        <testsuite name="all">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>